Today I would like to advice you a website which might be very helpful if you have a problem with verbs conjugation.
For example, you can find in the dictionary that 'to cook' is 'gotować' in Polish. But how to say: I cook, you cook, he/she cooks, we cook, you cook and they cook? Also how to conjugate this verb in the past tense or in the future? Sometimes it is complicated, so have a look here:
It is enough you will write the invinitive of any verb and you will see its conjugation. Be aware that there might be mistakes here. Anyway most of the conjugations should be correct.